Skullion Chieftan

The Skullions invaded Underworld in search of slaves, sport, and food. What they found was an unlikely ally in the world's leader, a demonic pretender that governs the worlds orbital cities named Kain. To keep the peoples of the Sky cities morale, and to oppress the peoples on the planet below, Kain struck a bargain with the invaders to have their ships withdraw from underworld, feigning an unconditional surrender, all the while leaving hunting parties to prey on the inhabitants of Underworld, preventing them from becomeing too powerful and rising up against him.

The Skullions are reptilian aliens with scales modified into armor plating, giving them their skeletal appearance.